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[80.56.215.227]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6b5bcf1acc0sm27300076d6.44.2024.07.02.08.01.13 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 02 Jul 2024 08:01:20 -0700 (PDT) From: Arend Van Spriel To: Jonas Gorski , Su Hui CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , Date: Tue, 02 Jul 2024 17:01:09 +0200 Message-ID: <19073f6bf08.279b.9b12b7fc0a3841636cfb5e919b41b954@broadcom.com> In-Reply-To: References: <20240702122450.2213833-1-suhui@nfschina.com> User-Agent: AquaMail/1.51.5 (build: 105105504) Subject: Re: [PATCH wireless 0/9] wifi: cfg80211: avoid some garbage values Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="0000000000009408f8061c44fc7c" --0000000000009408f8061c44fc7c Content-Type: text/plain; format=flowed; charset="us-ascii" Content-Transfer-Encoding: 8bit On July 2, 2024 4:02:39 PM Jonas Gorski wrote: > Hi, > > On Tue, 2 Jul 2024 at 14:50, Su Hui wrote: >> >> Clang static checker (scan-build) has some warnings as follows. >> >> included from drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c:16 >> drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil.h:123:2: >> warning:Assigned value is garbage or undefined [core.uninitialized.Assign] >> 123 | __le32 data_le = cpu_to_le32(*data); >> | ^~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~ >> drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c:138:3:warning >> Value stored to 'err' is never read [deadcode.DeadStores] >> >> There are some functions like brcmf_fil_{cmd,iovar,basscfg}_int_get() >> which read the value of its parameter, but some callers have not >> initialized these parameters which will be read. And this patchset fixes >> these problems. > > The core issue here seems to be that > brcmf_fil_{cmd,iovar,basscfg}_int_get() function (needlessly?) read > from *data. > > So instead of forcing all callers of > brcmf_fil_{cmd,iovar,basscfg}_int_get() to initialize *data first, I > suggest changing brcmf_fil_{cmd,iovar,basscfg}_int_get() to just not > read from it. > > I see no reason why they should care about what the previous value > was, since they are supposed to overwrite it anyway. The issue here is that these are generic functions and there is a reason. Some firmware API primitives allow/require the caller to pass selection parameters in *data. We wanted to keep the functions generic and leave out that knowledge. I suppose we could introduce a separate set of api functions for that purpose, but it seems like significant overhead to silence compiler warnings. Guess I underestimate the potential risk of leaking few bytes of stack data. 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